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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7952d9fb74d8a2398e0f4c4ea3d874ad1ea3742e9e9c2285458795f0a320b3' 
  AND token = 'crtNwEUZulV2eAj6mRn7lACG8el0mRQzNPhnXNtRD8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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