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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01562908008968ac3f7a91494f40c9981d3ac83bcd154dcbe3c390d7ac834828' 
  AND token = 'Y4Q+SCetLIrqAaVQ0ki4R6l8TfBGT/6r8sImDATaMxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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