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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82cde9491e1b16575a048b0532b6711963812153b8ba395645cd48a3bf2ba8b' 
  AND token = 'xr5e2RnwztuDDe5zgI5fOzEXg+SAHvv2ZtXqKRaTguw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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