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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b7fb240405e51403626edbcbb9b4a7c6d05eeeb3cc959ca2b4fb8a3c6cee6f' 
  AND token = 'VS/YIFUWZQSbQ+QYcnw3LDN/5tq5XLF6q4LTevI7Opw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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