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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6985bb9c3ecbf0525a9a68c5e9e925561911a963601c546cadd89573527426' 
  AND token = 'ahJnjZq+YYaHoH6J6pTAUw45VvA/VAmDvrM5pnB2tRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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