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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e43d78533b53d9167185ace73a9c506dafe67498a10a80f0fb505b5193997c02' 
  AND token = 'tNTuoIlW01mDwsSh1LBiDDbFoiL9tgf+CRUoC9or93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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