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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54432cf14bbe2ae8c42e453ff8c5e6b45c02a35b6d1fef07b5df2bb17a25a28' 
  AND token = 'isi0Ev5WA+8V9BXyQhT4DQRDobw1bjOb21i3DAqTkOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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