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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50df6538c42c446507248287b0d5b993e3595fe8f9887e7aedd4009e8224c25' 
  AND token = '1/ratlLMIUzkPc+dHQjS/UudURh573DrrDQnHfu4ZmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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