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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b1f7937551bdcf204d0b22cd9bc004aa0bd0e00db6427e4c790c2f97bb8d47' 
  AND token = 'Rf4rBD9sV4eumSz+/c401+4D+GKBkropDPCYBeREs34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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