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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdf5f66f6fb20f1446cf0f1fa60ed037902d6aa67bafab22a3a78298d48ba66' 
  AND token = '5DFIq22XDmJh1OhN34c0W5pABfSNVk5scQrjBg4TW1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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