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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347670eda9aea8027b90c1c196553dfc2a57749ec4380d19ca724026b6c70e7e' 
  AND token = 'X3DeYAEeNXFj7UWDxa9ytRUIX+bCpnF+6bn9AV1dSuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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