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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae5c7cc9029c71476e7b579ff7852da140c7a252f1448436f5c24019bf93eb8' 
  AND token = 'dbuqx0HOJN1OgmfkW/R1ujvH82ESDS+uUR8/EoCKFIE=' 
  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"
    }
  }
}