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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68d55a1aa3d35625ac62430706cd268a6efc467e547bdc8b32c1167ba4f20a2' 
  AND token = 'QpX6SILYtNzLAB4Dx4pVc5ebD0h1NltpleWv+7C2fPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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