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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e69e96bdb1855dd39dffeedb122dfb524679e0d7c2fa4fe6128672e85d21f09' 
  AND token = 'oH8lsxHXk2Q1wMXAB8QNjGKK7uQsWRd0b/A+Y/d0SDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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