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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72d6cc7af994a3654f1d7879698ce0fe3aeac6e22b3c1548f3426cb844e27e5' 
  AND token = 'wl6BgcHFSOdJ4itmL5aCppp8pXllKprr3zpyiJUvBvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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