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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1dc13ab4f01573532b019469ffc2ea91e0d50e4135c654a8eb7c25d61e1cff' 
  AND token = 'PEIa3o0bUPxwu816knU1A0h3pKucM/qng7yuo4Gtlb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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