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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54f7a3da0c51d7a3ed2eb3b4bcbe6fcd0b126c7bed0c4e71fdeffe59bb2beaa5' 
  AND token = 'wBLel/zx3Xt1g4grC3EZkaKjJxOVMpo/YknkD18dOVU=' 
  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"
    }
  }
}