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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba7b8bcb14d1ce99e28c1705b769a2af2da149c2d74a9dad5139c69858c0f31' 
  AND token = 'JkJGu3/XTg6mHSCaRnPURWNy7h04wkQTe79SCQNJJm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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