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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e1c975db92537d13576c5f2c1b3ba54871d4a7e1af7e5161206b4c995c673f' 
  AND token = 'bGD9diTfAwhZR8P/D6Uro/51tD08Q3lFVnFktfsufQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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