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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4de6a06edb39ec6e8cde7de5705b20eea63a6eaabdd59fb366fae5c4086d540' 
  AND token = 't1F2Lqmrl71DXAdF8SwGgTk4U62LC2S0B7z0sguRGGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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