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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04378964f58e950d65070a2ebd2ce8f82f8488563e99499b124f06801fa2b06c' 
  AND token = '6ljy18Rn5cyy0pdvYVbb5DOE0zXj8wv1iGopvMjRvpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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