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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a58da28a8a6e729c8228072f26e5f7cd73dd21cd226e042bddfb6f163ec4e6' 
  AND token = 'Rgt+uly6qbpWmS/UW2hRN/HVv1SToNMQprXH5gm5FOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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