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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5fdd0f11c158266e33a1091d8f4f088523b16591132d49a89f9df0112d9bda' 
  AND token = 'xP/Xjh9Jl1fnZtjw/SAFSI69varSCAzxqIoIgOitxA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}