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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1598f20cfea650b01b8d04f46fb2b84139cd07052ca5992dea3b1555e4b41e8' 
  AND token = '+4kSh5NHKn/UDTyCjTo3M3muevltiN2XcpIPze0MCj8=' 
  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"
    }
  }
}