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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e52d5552d58c5831fd737337a20126d29e1752d979e43d54787120846f5209' 
  AND token = 'F1uMmIYOv+/0C3kBNE3xPTbZw1UF5MIWR7O62w64+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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