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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fa315c67fb3da0a1e150c21fe953a5e98b8d9f66f3094fc6534038f1131c0e' 
  AND token = '9E8sO8OS2PqW+YbQgxFzRoDtnZE3VjXqXG5r1htpa0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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