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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1159cedeb26f54d82eda47202a86e8f3ee158d89c9c57e1e3ca5258aca1381fe' 
  AND token = 'mynUExV7yRpv4yjTGtxIGO+mqDBJzaswe9gcy9dGmqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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