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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69c3fe233e7e5a953e8dd87705f767f06763dfe2cbad80c9e14679f57058ee4' 
  AND token = '/QHXvm73jX1eZng8S8t/2+X6O5aYm8u6dkkNawYuaFs=' 
  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"
    }
  }
}