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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e994552bef9627658226af33ddb586f764399c940fd2f247a3a0dbcde09c717' 
  AND token = 'xurv4kG0SJgCG1/uoynQ56/hFItnhqd5fUtvu+C3oa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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