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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84ccce38087030917fd9b7c4e6329db03b82295ec9c9a8d419eecf00efece84' 
  AND token = 'WHjqL8SsaY2sMitN7v5eC/OyvlG7hfGqtb35mxRi9K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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