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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf0885e6b5109fe8efdb2af4e871e5f319b81272de0774ea035e8d814bc11b3' 
  AND token = 'yHf6IW5LJP2X2+hwKwMUTiKankrjAxfbT1GkYp+VNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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