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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861e4fdd551b33081895c1f8b94160c9dae030f2923c91c6f1ba29fbc7654188' 
  AND token = '73ywwWmMEZirK7I4t1Ja0Y0xEW5RAsBopd6120pPzqQ=' 
  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"
    }
  }
}