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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5f383a72d387ab4a5a2e007c6048d6c5dbf5b2f5661e6823cf3ae214ace3f4' 
  AND token = '4P/U0rYkSJguIdFBC6wO85GIXmm1fg5TFwnhAPZGweg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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