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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc6f468a67c3f0c0f81c57593e1e6800d68d797fbed2cccfbcc972ee725dd78' 
  AND token = 'xeleFFO+A39PtvfaCWWc03XQA/JmC635ZKwdw7rNINc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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