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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7d1b06661f1936f33c6a801b3ea538dae6b782397e91d62e122bb2fb841376' 
  AND token = 'uYOmwRM0iAMs0+WeBOSdTk+seAZN+V+Mz79TZ6f3NQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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