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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498610cd6ac0e73bbec6860e489b7bd5de23c721c07168323b42c5dff8c7663d' 
  AND token = '5z/8lNuK0O7ACftMmtjIdku1r4jHMgbWIfYnQDDPgCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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