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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20160eff14238c92d46b1e9cdc46812abd5c17a6b66dcd6eb155c5f98a6e7f5' 
  AND token = 't5VL70853ktARWf+iC46UiAZtfcJjDiNdKPP4uyTblQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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