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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eec682c898c1f60330fd3d7d5d6d1860f04413b544e694d71c2ed881998d881' 
  AND token = 'Ge3X6f1VUNUfX0fZzDMAgVm6Jc2kxDOiy3gYl8KZxKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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