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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb9d8690845bb6ba40643749d2c1d8737de51ed517d8717d63465503bcebfd5' 
  AND token = 'iE02gd6YuZhSHA7prcPPqediK/Rd/zFkj/WESSHe1TQ=' 
  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"
    }
  }
}