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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d256b14f18f76beaf416842825fe47de93b3c137a2a47baa70612c342d4f776' 
  AND token = 'vGN+xiAHqM+X+VTIlEeITzQrY/Py9zH7OGNGtQf3Sbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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