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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31216aee4df3f85ca3f5923c62db7ffa854f7561bf584981e2c3940caf8e96e' 
  AND token = 'H5pRQWRPlm7Rx3jzVVstXer1MRpvJ/eZW3bIZrWsSsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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