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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf3ed765d0e5d952487b70bdc3c84edf60ef77e0479e2d57024132cdc46d369' 
  AND token = 'xb8Vpa+EHh7uNc/n2W9JYobNco1dn6UZ1nSdETEeHPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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