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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d8195eef23efaf9b7c03a05676ec89cf565c28ee31d517fcfbcfa2a1a99716c' 
  AND token = 'Bf+xFGIdHzOaeHUhbU4ZM7wB4i6h0N691y9csabPkRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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