SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211e62c43e8af83cf69693369e01747719cd8c70a555ab63c07ba7f3a0b48985' 
  AND token = 'wzhpLkV9xg9b/VjIbdSjPFfvIV2d7K79bCBwoQuHFmY=' 
  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"
    }
  }
}