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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf0ae92e0cde4fc41379162419eb8a2d76456db66ff47fcd5ee9bebc458729c' 
  AND token = '/kwvrrMruXxAmc2IAJe1opCQ99Zco7WOnXptnrNRapM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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