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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18c49c8748c5d8880f3ec388e154bfc1d644cef9dc610b64cd96ee07b0b20a57' 
  AND token = 'F+nqYQiiqY8B66xNUwRU3xxHsVrTWYrpgE972PT78Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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