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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e475fccd7e67ad1c492bbc7c107069b75a98f54168d9b210780d72173f09d38' 
  AND token = 'qlOXty4qYa6BslWe1e8VjXvdtgMd5PVnzyHWIgyEqnA=' 
  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"
    }
  }
}