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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8027ca4d50002968a8c9c3584e892d502a0d9795f2a7b00c505c4a02f9ea18' 
  AND token = '+M+Y7AiQsoNWIOSVQklSV3lu74PUQUFerzpACg2T1RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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