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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859da276c617507886c3d7661f1728ad3ccb62317ac6ca3f5b1fd61a99c6794e' 
  AND token = 'tc5feRO+E0Zmwk3+auoL252IB0JvotWGzpbO0jLpKH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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