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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a24db07f558d7c6fe268c4c00f98e6ef38474df03fc46d19a91c9a3ab059d82' 
  AND token = 'g/hhb2Qi0RoZ/07+2bpcBHTlewNZAiCC4zarUZLSiwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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