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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03615e11506391ae2df1680552d04cf4c821f9b12e3585ef8a1297c93442183b' 
  AND token = 'WBBTj4/UprvIfmhPcJ2xR3g/D6NoWEnU+XCiapt/Aok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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