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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3496d35caa085304f4760f1360e93692f5bc9380b3b9c30969b5519717b637' 
  AND token = 'nV4HQUlR9R6ZhD4razLupKVjTwSy7EHp8F57gCRxfY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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