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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b225beffad31e9ac49b2cc83046af70eca3442469938f2de8c28d47d20a84b6' 
  AND token = 'hM6JfNAo5oxfXOgQF70FVIRvTcZmwKE8/rDcF3JgJSE=' 
  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"
    }
  }
}