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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef28fb37417ef7d07791cd232488caea82f88b44f93d2e45536ebf939854ff8' 
  AND token = 'DINyknD4FH1G+JNsdwhjRWzj/iIyLz1eQZ8mfTgX2kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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