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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb54236ff36ec35a6eaf9d048a7753e414c341ff3ce8c3c793399e2830ed56dd' 
  AND token = '/72mEzAUbDx/yugm23orRs8cN3mZPQxnOeYsC2uzyqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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