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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e238b32954ffa8b0386fd81ef77b316ec67a3e7ffc265de1153bb2fecdc1b04' 
  AND token = '8Z+vCKlW3nCVzHvZJfl+/VK++E6smSfm8Rf0PTr5QAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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