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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a553bbca61a162e63ed65a7a79d8c3e8f9417339a9297f119111d7634d33e056' 
  AND token = 'SOAOb9+f5EnDxOCtwSu+C7GF27NQ4pXjwl9V3E7Y2LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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