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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f43f340109679dd86e5a2e59485e1548c10b27f73a91a2e8e47e17bee7f41d' 
  AND token = 's/wEbDmGPD92rCt2cD181szAQUaheEkyeu2yFKq12Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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