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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9e8ad6df666e7274fc095b872eeeb270bce3473a125d72979ce1af29d3a066' 
  AND token = 'yX2W4dzzchX2Fxh3lz7u2RV0GaH109THe30iUnbd+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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