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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ba5b1a5b0f6ae2da6a582c326b389bf12f4ed9675d71ffab82d706fe2143fd' 
  AND token = '//CkC142oyh9eAoiX5MTx6q/SMoKteMGn8CUVF1UPyU=' 
  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"
    }
  }
}