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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80213eadc18bcccdf1b3b74410cbb42f48e52587dacfe441ff37fa17492ccd08' 
  AND token = '/+OOf2Z+THv0lxegYw1ON6L3GJb+peXFNCDJ+4S7WIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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