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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f95ab99f28ed4332f5742b3eade059adf2a7c62d169f40efadd5c736d0d50d2' 
  AND token = 'rEH9BHJWoufNHHVLPq8cKrN9alMVaLKCf6fSlrnf3Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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